Transcript Nerve activates contraction

2
Basic Chemistry
PART B
PowerPoint® Lecture Slide Presentation by Jerry L. Cook, Sam Houston University
ESSENTIALS
OF HUMAN
ANATOMY
& PHYSIOLOGY
EIGHTH EDITION
ELAINE N. MARIEB
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Biochemistry: Essentials for Life
 Organic compounds
 Contain carbon
 Most are covalently bonded
 Example: C6H12O6 (glucose)
 Inorganic compounds
 Lack carbon
 Tend to be simpler compounds
 Example: H2O (water)
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Important Inorganic Compounds
 Water
 Most abundant inorganic compounds
 Vital properties
 High heat capacity
 Polarity/solvent properties
 Chemical reactivity
 Cushioning
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Important Inorganic Compounds
 Salts
 Easily dissociate into ions in the presence
of water
 Vital to many body functions
 Include electrolytes which conduct
electrical currents
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Important Inorganic Compounds
 Acids
 Can release detectable hydrogen ions
 Bases
 Proton acceptors
 Neutralization reaction
 Acids and bases react to form water and a
salt
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
pH
 Measures relative
concentration of
hydrogen ions
 pH 7 = neutral
 pH below 7 =
acidic
 pH above 7 = basic
 Buffers: chemicals
that can regulate
pH change
Figure 2.11
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Important Organic Compounds
 Carbohydrates
 Contain carbon, hydrogen, and oxygen
 Include sugars and starches
 Classified according to size
 Monosaccharides – simple sugars
 Disaccharides – two simple sugars joined by
dehydration synthesis
 Polysaccharides – long branching chains of
linked simple sugars
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Important Organic Compounds
 Lipids
 Contain carbon, hydrogen, and oxygen
 Carbon and hydrogen outnumber oxygen
 Insoluble in water
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LIPIDS ANIMATION
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Lipids
 Common lipids in the human body
 Neutral fats (triglycerides)
 Found in fat deposits
 Composed of fatty acids and glycerol
 Source of stored energy
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Lipids
 Common lipids in the human body
(continued)
 Phospholipids
 Form cell membranes
 Steroids
 Include cholesterol, bile salts, vitamin D, and
some hormones
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Important Organic Compounds
 Proteins
 Made of amino acids
 Contain carbon, oxygen, hydrogen, nitrogen,
and sometimes sulfur
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Proteins
 Account for over half of the body’s organic
matter
 Provides for construction materials for
body tissues
 Plays a vital role in cell function
 Act as enzymes, hormones, and antibodies
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CHEMISTRY OF LIFE© PROTEINS: ENZYME ANIMATION
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Enzymes
 Act as biological catalysts
 Increase the rate of chemical reactions
Figure 2.17
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Important Organic Compounds
 Nucleic Acids
 Provide blueprint of life
 Nucleotide bases
 A = Adenine
 G = Guanine
 C = Cytosine
 T = Thymine
 U = Uracil
 Make DNA and RNA
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Nucleic Acids
 Deoxyribonucleic acid
(DNA)
 Organized by
complimentary bases
to form double helix
 Replicates before cell
division
 Provides instruction
for every protein in
the body
Figure 2.18c
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Important Organic Compounds
 Adenosine triphosphate (ATP)
 Chemical energy used by all cells
 Energy is released by breaking high
energy phosphate bond
 ATP is replenished by oxidation of food
fuels
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Adenosine Triphosphate (ATP)
Figure 2.19a
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